Research design.
D000886:Anthropometry; D002657:Child Development; D002662:Child Health Services; D005260:Female; D005500:Follow-Up Studies; D005527:Food, Fortified; D006166:Guatemala; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011295:Prenatal Care; D011502:Protein-Energy Malnutrition / Q000517:prevention & control; D012107:Research Design